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Our Rube Goldberg Device The Christmas Card Opener

Our Rube Goldberg Device The Christmas Card Opener. Group Members. Katie Agle Travis Davis Jesse Farrar. Our Device. The objective for our device was to perform a very simple task by a convoluted means, illustrative of the principle of energy conversion.

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Our Rube Goldberg Device The Christmas Card Opener

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  1. Our Rube Goldberg DeviceThe Christmas Card Opener

  2. Group Members • Katie Agle • Travis Davis • Jesse Farrar

  3. Our Device • The objective for our device was to perform a very simple task by a convoluted means, illustrative of the principle of energy conversion. • We chose the opening of a Christmas card for our goal. • The device utilizes a marble, given a velocity from a spring, which then moves through a series of inclined tunnels. It then drops onto a board filled with pushpins to direct it to its final resting place, one end of a seesaw. The opposite end of the seesaw pulls a string which lifts open the card.

  4. Design Process • The project went through a few iterations. At first, we wanted to raise a flag or open a box of chocolates but we scrapped those two in favor of our current Christmas card setup. • We were also going to use a spiral path for the marble to travel on to get to the plinko board, but in the interest of cost, we opted for our aluminum foil tunnels. • The current setup is the simplest, cheapest, and most reliable combination of components. It also allowed for easier energy conversion equations.

  5. Energy Conversions • The spring on top of the tower with potential energy discharges that energy into a marble, which enters into foil turn and down the first tube. (Potential spring to Kinetic) • At the top of the tube, the marble has the exit velocity of the turn and at the bottom, the height has decreased. (Gravitational Potential to Kinetic) • The velocity at the top and bottom of the middle tube is zero, and thus it is ignored. • The final velocity out of the plinko board ignores the minor collisions of the pushpins. (Gravitational Potential to Kinetic) • The see-saw does not convert any energy.

  6. Analysis Spring 1/2kx^2=1/2mvo^2 1st drop 1/2mvo^2+mgho=1/2mv^2+mgh 2nd drop to plinko board mgho=1/2mv^2+ mgh Plinko Board 1/2mvo^2+mgho=1/2mv^2+mgh

  7. Materials • Popsicle sticks- 2 packs @ 2.50 ea • Tacky Glue- .75 per bottle • Spring- .99 for 2 • Marble-.88 for 100 • Construction Paper- 2.50 for 18 pages • Push pins- .97 for 100 • Tape-1.25 per roll • Bobbins-1.00 for four • String-.50 for one roll • Paper clips- .50 for one pack • Rubber bands- .50 for one pack

  8. A Demonstration

  9. Success!

  10. Conclusion • We accomplished our goals to have a cheap, reliable, and convoluted system to complete a simple task. • We learned about how energy conversions work in the real world versus what we see in problems. • Most of our ideas came from the previous year’s EF151 projects. We were able to see which ones went over budget and which looked to be the best examples.

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